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MIX meat and pepper; shape into 4 (1/2-inch-thick) oval patties. Melt 1 tsp. butter in large skillet on medium heat. Add patties; cook 5 min. on each side or until done (160ºF). Transfer to platter; cover to keep warm.
MELT remaining butter in same skillet. Add mushrooms and onions; cook and stir 3 min. Stir in Worcestershire sauce; cook and stir 2 min or until onions are crisp-tender.
ADD cooking creme; cook 2 to 3 min. or until heated through, stirring frequently. Spoon over patties; top with parsley.